**Core Concept**
Sealers are materials used in endodontics to fill the root canal system. They are typically composed of resin-based materials, calcium hydroxide, or other substances that help to prevent bacterial leakage and ensure the success of the root canal treatment.

**Why the Correct Answer is Right**
Medicated sealers are used to deliver antimicrobial agents directly to the root canal system. They contain substances like calcium hydroxide, chlorhexidine, or other antimicrobial agents that help to control infection and promote healing. These medicated sealers are designed to release their active ingredients over time, providing ongoing antimicrobial protection.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is a medicated sealer because it contains an antimicrobial agent that helps to control infection in the root canal system.
**Option B:** This option is a medicated sealer because it is designed to release antimicrobial agents directly into the root canal system.
**Option C:** This option is a medicated sealer because it contains a substance that helps to prevent bacterial leakage and promote healing in the root canal system.

**Clinical Pearl / High-Yield Fact**
It's essential to note that medicated sealers can interact with other endodontic materials, so it's crucial to follow the manufacturer's instructions and take necessary precautions to ensure the success of the root canal treatment.

**Correct Answer: C. This option is not a medicated sealer.**